The 4th New Brunswick Legislative Assembly represented New Brunswick between February 8, 1803, and 1809.
The assembly sat at the pleasure of the Governor of New Brunswick Thomas Carleton. Carleton left the province in 1805 and the colony was governed by a series of colonial administrators after his departure.
Amos Botsford was chosen as speaker for the house.
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| Electoral District | Name | First elected / previously elected |
|---|---|---|
| Charlotte | Robert Pagan | 1786 |
| Ninian Lindsay | 1802 | |
| Hugh Mackay | 1802 | |
| Joseph Porter | 1802 | |
| Kings | John Coffin | 1786 |
| George Leonard | 1801 | |
| Northumberland | James Fraser | 1795 |
| Alexander Taylor | 1802 | |
| Queens | James Peters | 1793 |
| John Yeamans | 1786 | |
| Saint John City | George Younghusband | 1793 |
| John Robinson | 1802 | |
| Saint John County | William Pagan | 1786 |
| Bradford Gilbert | 1793 | |
| Hugh Johnston | 1802 | |
| Edward Sands [a] | 1802 | |
| Munson Jarvis (1804) | 1804 | |
| Sunbury | James Glenie | 1789 |
| Elijah Miles | 1802 | |
| Westmorland | Amos Botsford | 1786 |
| Benjamin Wilson | 1802 | |
| James Easterbrooks | 1802 | |
| Hugh McMonagle | 1802 | |
| Titus Knapp (1803) | 1803 | |
| York | John Davison | 1802 |
| Archibald McLean | 1793 | |
| Walter Price | 1802 | |
| Stair Agnew | 1796 |